package object;

public class IntegerDemo {
    public static void main(String[] args) {
        String s1 = "39";
        int age = Integer.parseInt(s1);
        System.out.println(age);

        String s2 = "123.456";
        double price = Double.parseDouble(s2);
        System.out.println(price);










        /*
        String s1 = "39";
        int age = Integer.parseInt(s1);
        System.out.println(age);

        String s2 = "123.456";
        double price = Double.parseDouble(s2);
        System.out.println(price);

         */









        /*
        int max = Integer.MAX_VALUE;
        int min = Integer.MIN_VALUE;
        System.out.println("int的最大值为:"+max+",最小值为:"+min);

        long max1 = Long.MAX_VALUE;
        long min1 = Long.MIN_VALUE;
        System.out.println("long的最大值为:"+max1+",最小值为:"+min1);

         */








        /*
        Integer i = 5;//装箱，基本类型到包装类，Integer i = Integer.valueOf(5)
        int j = i;//拆箱，包装类到基本类型,int j = i.intValue();

         */




        /*
        Integer i1 = new Integer(5);
        Integer i2 = new Integer(5);
        System.out.println(i1==i2);
        System.out.println(i1.equals(i2));



        Integer i3 = Integer.valueOf(5);
        Integer i4 = Integer.valueOf(5);
        System.out.println(i3==i4);
        System.out.println(i3.equals(i4));


        int i = i4.intValue();
        System.out.println(i);

         */
    }
}
